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Nonribosomal peptides (NRP) are a class of secondary metabolites, usually produced by microorganisms like bacteria and fungi. These are also often found in higher organisms, such as nudibranchs but they are thought to be made by bacteria inside these organisms. Note that although there are many peptides which are not made on the ribosome, nonribosomal peptide typically refers to a very specific set of these as discussed in this article. Secondary metabolites, also known as natural products, are those products (chemical compounds) of metabolism that are not essential for normal growth, development or reproduction of an organism. ...
A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ...
Phyla/Divisions Actinobacteria Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Nitrospirae Omnibacteria Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Bacteria (singular, bacterium) are a major group of living organisms. ...
Divisions Chytridiomycota Zygomycota Ascomycota Basidiomycota The Fungi (singular: fungus) are a large group of organisms ranked as a kingdom within the Domain Eukaryota. ...
Infraorders See text. ...
Figure 1: Ribosome structure indicating small subunit (A) and large subunit (B). ...
Unlike polypeptides synthesized on the ribosome, these peptides are synthesized by nonribosomal peptide synthetases (NRPS) from amino acids. NRPS can be thought of as preassembled, modular, molecular factories. Unlike the ribosome, which is fed an mRNA code and can make an arbitrary sequence of peptides, an NRPS does not accept a code and is preset to make one peptide. As a class, NRPS can make a wider diversity of peptides than can ribosomes. Figure 1: Ribosome structure indicating small subunit (A) and large subunit (B). ...
Peptides (from the Greek πεπτος, digestible), are the family of short molecules formed from the linking, in a defined order, of various α-amino acids. ...
In biochemistry, a ligase is an enzyme that can catalyse the joining of two molecules (ligation or glue together) by forming a new chemical bond, with concomitant hydrolysis of ATP or other similar molecules. ...
In chemistry, an amino acid is any molecule that contains both amino and carboxylic acid functional groups. ...
NRPs often have a cyclic and/or branched structure, contain non-proteinogenic amino acids including D-amino acids, carry modifications like N-methyl and N-formyl groups, or are glycosylated, acylated, halogenated, or hydroxylated. Cyclization of amino acids against the peptide "backbone" is often performed, resulting in oxazolines and thiazolines; these can be further oxidized or reduced. Occasionally dehydration is performed on serines resulting on dehydroalanine. This is just a sampling of the various manipulations and variations that NRPS can perform. NRPs are often dimers or trimers of identical sequences chained together or cyclized, or even branched. In organic chemistry, a cyclic organic compound is one in which a series of carbon atoms are connected together to form a loop or ring. ...
The twenty amino acids that are coded in the standard genetic code are called proteinogenic (protein building). ...
General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ...
Glycosylation is the process or result of addition of saccharides to proteins and lipids. ...
In chemistry, acylation is the process of adding an acyl group to a compound. ...
In chemistry, halogenation is a chemical reaction that replaces a hydrogen atom with a halogen atom. ...
Hydroxylation is any chemical process that introduces one or more hydroxyl groups (-OH) into a compound (or radical) thereby oxidising it. ...
Serine is one of the 20 natural amino acids. ...
Sucrose, or common table sugar, is composed of glucose and fructose. ...
Trimer might refer to: trimer (chemistry), a reaction product composed of three identical molecules trimer (biochemistry), a compound of three macromolecules non-covalently bound This is a disambiguation page: a list of articles associated with the same title. ...
Nonribosomal peptides are structurally a very diverse family of natural products with an extremely broad range of biological activities and pharmacological properties. They are often toxins, siderophores, or pigments. Nonribosomal peptide antibiotics, cytostatics, and immunosuppressants are in commercial use. A Siderophore (greek for iron carrier) is an iron chelating compound secreted by microorganisms. ...
In biology, pigment is any material resulting in color in plant or animal cells which is the result of selective absorption. ...
An antibiotic is a drug that kills or slows the growth of bacteria. ...
Chemotherapy is the use of chemical substances to treat disease. ...
Immunosuppression is the medical suppression of the immune system. ...
Examples
An antibiotic is a drug that kills or slows the growth of bacteria. ...
Vancomycin is an antibiotic used in the prophylaxis and treatment of infections caused by Gram-positive bacteria. ...
An antibiotic is a drug that kills or slows the growth of bacteria. ...
Penicillin nucleus Penicillin refers to a group of β-lactam antibiotics used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms. ...
Chemotherapy is the use of chemical substances to treat disease. ...
Bleomycin is an anti-cancer agent. ...
Immunosuppression is the medical suppression of the immune system. ...
Cyclosporine, Ciclosporin (INN), or cyclosporin (former BAN), is an immunosuppressant drug. ...
A Siderophore (greek for iron carrier) is an iron chelating compound secreted by microorganisms. ...
In biology, pigment is any material resulting in color in plant or animal cells which is the result of selective absorption. ...
The venom of the black widow spider is a potent latrotoxin. ...
Chemical structure of Microcystin LR Microcystins are cyclic nonribosomal peptides produced by cyanobacteria. ...
A Cyanotoxin is a toxin secreted by certain cyanobacteria (blue-green algae). ...
Orders The taxonomy of the Cyanobacteria is currently under revision. ...
The structure of alpha-amanitin alpha-Amanitin or α-amanitin is a cyclic nonribosomal peptide of eight amino acids. ...
Binomial name Amanita phalloides (Vaill. ...
Cyanophycin, or multi-L-arginyl-poly(L-aspartic acid), is a non-protein, non-ribosomally produced amino acid polymer. ...
Orders The taxonomy of the Cyanobacteria is currently under revision. ...
Biosynthesis Nonribosomal peptides are synthesized by one or more specialized nonribosomal peptide-synthetase (NRPS) enzymes. The NRPS genes for a certain peptide are usually organized in one operon in bacteria and in gene clusters in eukaryotes. The enzymes are organized in modules that are responsible for the indroduction of one additional amino acid. Each module consists of several domains with defined functions, separated by short spacer regions of about 15 amino acids. Ribbon diagram of the enzyme TIM. TIM is catalytically perfect, meaning its conversion rate is limited, or nearly limited to its substrate diffusion rate. ...
An operon is a group of key nucleotide sequences including an operator, a common promoter, and one or more structural genes that are controlled as a unit to produce messenger RNA (mRNA). ...
Kingdoms Animalia - Animals Fungi Plantae - Plants Protista A eukaryote (also spelled eucaryote) is an organism with complex cells, in which the genetic material is organized into membrane-bound nuclei. ...
Domain has several meanings: // General some kind of territory, such as (for example) a demesne or a realm synonymous with a metaphorical field, e. ...
The biosynthesis of nonribosomal peptides shares similarities with the polyketide and fatty acid biosynthesis. Due to these structural and mechanistic similarities some nonribosomal peptide synthetases contain Polyketide synthase modules for the insertion of acetate or propionate derived subunits into the peptide chain. Biosynthesis is a phenomenon where chemical compounds are produced from simpler reagents. ...
Polyketides are secondary metabolites from bacteria, fungi, plants, and animals. ...
In chemistry, especially biochemistry, a fatty acid is a carboxylic acid (or organic acid), often with a long aliphatic tail (long chains), either saturated or unsaturated. ...
Polyketides are secondary metabolites from bacteria, fungi, plants, and animals. ...
Acetate, or ethanoate, is the anion of a salt or ester of acetic acid. ...
Propionic acid (systematically named propanoic acid) is a naturally occurring carboxylic acid with chemical formula CH3CH2COOH. In the pure state, it is a colorless, corrosive liquid with a pungent odor. ...
Modules The order of modules and domains of a complete nonribosomal peptide synthetase is as follows: - Initiation or Starting module: [F/NMe]-A-PCP-
- Elongation or Extending modules: -(C/Cy)-[NMe]-A-PCP-[E]-
- Termination or Releasing module: -(TE/R)
(Order: N-terminus to C-terminus; []: optionally; (): alternatively) The N-terminal end refers to the extremity of a protein or polypeptide terminated by an amino acid with a free amine group (NH2). ...
The C-terminal end refers to the extremity of a protein or polypeptide terminated by an amino acid with a free carboxyl group (COOH). ...
Domains - F: Formylation (optional)
- A: Adenylation (required in a module)
- PCP: Thiolation and Peptide Carrier Protein with attached 4'-phospho-pantethein (required in a module)
- C: Condensation forming the amide bond (required in a module)
- Cy: Cylization into thiazoline or oxazolines (optional)
- Ox: Oxidation of thiazolines or oxazolines to thiazoles or oxazoles (optional)
- Red: Reduction of thiazolines or oxazolines to thiazolidines or oxazolidines (optional)
- E: Epimerization into D-amino acids (optional)
- TE: Termination by a thio-esterase (only found once in a NRPS)
- R: Reduction to terminal aldehyde or alcohol (optional)
Starting stage - Loading: The first amino acid is activated with ATP as a mixed acyl-phosphoric acid anhydride with AMP by the A-domain and loaded onto the serine-attached 4'-phospho-pantethein (4'PP) sidechain of the PCP-domain catalyzed by the PCP-domain (thiolation) .
- Sometimes the amino group of the bound amino acid is formylated by an F-domain or methylated by an NMe-domain.
Adenosine 5-triphosphate (ATP) is a multifunctional nucleotide primarily known in biochemistry as the molecular currency of intracellular energy transfer. ...
An acyl or acyl group is any radical (or functional group) obtained from an carboxylic acid by the removal of the carboxylic hydroxyl group. ...
R-phrases S-phrases , , Supplementary data page Structure and properties n, εr, etc. ...
In chemistry, an anhydride is a compound that can be considered as derived from another compound by subtracting the atoms of water. ...
Adenosine monophosphate, also known as 5-adenylic acid and abbreviated AMP, is a nucleotide that is found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine. ...
Serine is one of the 20 natural amino acids. ...
In biochemistry, methylation refers to the replacement of a hydrogen atom (H) with a methyl group (CH3), regardless of the substrate. ...
Elongation stages - Loading: Analogous to the starting stage, each module loads its specific amino acid onto its PCP-domain.
- Condensation: The C-domain catalyzes the amide bond formation between the thioester group of the growing peptide chain from the previous module with the amino group of the current module. The extended peptide is now attached to the current PCP-domain.
- Epimerization: Sometimes an E-domain epimerizes the innermost amino acid of the peptide chain into the D-configuration.
- This cycle is repeated for each elongation module.
Condensation is the change in matter of a substance to a denser phase, such as gas (or vapor) to a liquid. ...
In chemistry, an amide is either the organic functional group characterized by a carbonyl group linked to a nitrogen atom, a compound that contains this functional group, or a particular inorganic anion. ...
A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing, as well as exchanging, of electrons -or electrostatic forces. ...
Thioesters are compounds resulting from the bonding of sulfur with an acyl group (an alkyl group attached to a carbon-oxygen double bond), with the general formula R-S-CO-R. Some biochemists believe that the thioester bond was critical for the origin of life. ...
Condensation is the change in matter of a substance to a denser phase, such as gas (or vapor) to a liquid. ...
Serine is one of the 20 natural amino acids. ...
Threonine is one of the 20 natural amino acids. ...
Cysteine is a naturally occurring hydrophobic amino acid which has a thiol group and is found in most proteins, though only in small quantities. ...
General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless Atomic mass 14. ...
Oxazolidines consist of one or more five-membered heterocyclic rings containing oxygen and nitrogen. ...
Thiazolidine is a heterocycle. ...
In chemistry, an epimer is a stereoisomer that has a different configuration at only one of several stereogenic centers. ...
Termination stage - Termination: The TE-domain (thio-esterase domain) hydrolyzes the completed polypeptide chain from the ACP-domain of the previous module, thereby often forming cyclic amides (lactams) or cyclic esters (lactones).
- Alternatively, the peptide can be released by an R-domain that reduces the thioester bond to terminal aldehyde or alcohol.
Hydrolysis is a chemical process in which a molecule is split into two parts by the addition of a molecule of water. ...
A lactam (the noun is a grammatical blend from lactone + amide) is a cyclic amide. ...
General formula of an ester of a carboxylic acid. ...
In chemistry, the condensation of an alcohol group and a carboxylic acid group which are atached to the same molecule, leads to a cyclic ester. ...
Reduction or reducing has several meanings: In mathematics, reduction is the process of manipulating a series of equations or matrices into a desired simpler format. ...
An aldehyde is either a functional group consisting of a terminal carbonyl group or a compound containing a terminal carbonyl group. ...
In chemistry, an alcohol is any organic compound in which a hydroxyl group (-OH) is bound to a carbon atom, which in turn is bound to other hydrogen and/or carbon atoms. ...
Processing The final peptide is often modified, e.g. by glycosylation, acylation, halogenation, or hydroxylation. The responsible enzymes are usually associated to the synthetase complex and their genes are organized in the same operons or gene clusters. Glycosylation is the process or result of addition of saccharides to proteins and lipids. ...
In chemistry, acylation is the process of adding an acyl group to a compound. ...
In chemistry, halogenation is a chemical reaction that replaces a hydrogen atom with a halogen atom. ...
Hydroxylation is any chemical process that introduces one or more hydroxyl groups (-OH) into a compound (or radical) thereby oxidising it. ...
An operon is a group of key nucleotide sequences including an operator, a common promoter, and one or more structural genes that are controlled as a unit to produce messenger RNA (mRNA). ...
Priming and Deblocking To become functional, the 4'-phospho-pantethein sidechain of acyl-CoA molecules has to be attached to the PCP-domain by 4'PP transferases (Priming) and the S-attached acyl group has to be removed by specialized associated thioesterases (TE-II) (Deblocking). Categories: Biochemistry stubs | Thiols ...
General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ...
An acyl or acyl group is any radical (or functional group) obtained from an carboxylic acid by the removal of the carboxylic hydroxyl group. ...
Substrate specificities Most domains have a very broad substrate specificity and usually only the A-domain determines which amino acid is incorporated in a module. Ten amino acids have been identified that control substrate specificity and can be considered the 'codons' of nonribosomal peptide synthesis. The condensation C-domain is also believed to have substrate specificity, especially if located behind an epimerase E-domain containing module where it functions as a 'filter' for the epimerized isomer. In biochemistry, a substrate is a molecule which is acted upon by an enzyme. ...
In binary testing, e. ...
RNA codons. ...
In chemistry, isomers are molecules with the same chemical formula and often with the same kinds of bonds between atoms, but in which the atoms are arranged differently. ...
Mixed with Polyketides Due to the similarity with polyketide synthetases (PKS), many secondary metabolites are in fact fusions of NRPs and polyketides. This essentially occurs when PK modules follow NRP modules, and vice versa. There is high degree of similarity between the PCP domains of both types of sythetases, although the mechanism of condensation is different from a chemical standpoint (claisen vs. transesterification).
See also An esterase is an hydrolase enzyme that splits esters into a acid and an alcohol in a chemical reaction with water called hydrolysis. ...
Polyketides are secondary metabolites from bacteria, fungi, plants, and animals. ...
Literature - "Nonribosomal peptides: from genes to products" by Dirk Schwarzer, Robert Finking, and Mohamed A. Marahiel in Nat. Prod. Rep. 20(3):275-287 (2003) DOI: 10.1039/b111145k
- "Modular Peptide Synthetases Involved in Nonribosomal Peptide Synthesis" by Mohamed A. Marahiel, Torsten Stachelhaus, and Henning D. Mootz in Chem. Rev. 97(7):2651-2673 (1997) DOI: 10.1021/cr960029e
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